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United States Patent | 5,614,456 |
Mink ,   et al. | March 25, 1997 |
The interaction of silica, previously calcined at 600.degree. C., with dibutylmagnesium (DBM), 1-butanol and titanium tetrachloride and a solution of methylalumoxane (MAO) and (BuCp).sub.2 ZrCl.sub.2 provides a catalyst that, in the absence of a trialkylaluminum (AlR.sub.3) cocatalyst, produces polyethylene with a bimodal MWD.
Inventors: | Mink; Robert I. (Warren, NJ); Nowlin; Thomas E. (West Windsor, NJ); Schregenberger; Sandra D. (Neshanic, NJ); Shirodkar; Pradeep P. (Somerset, NJ); Tsien; Grace O. (Colonia, NJ) |
Assignee: | Mobil Oil Corporation (Fairfax, VA) |
Appl. No.: | 333684 |
Filed: | November 3, 1994 |
Current U.S. Class: | 502/115; 502/104; 502/107; 502/113; 502/117 |
Intern'l Class: | B01J 031/00; B01J 031/16; B01J 031/22 |
Field of Search: | 502/104,107,113,115,117 |
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